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ALSA: timer: Simplify timer hw resolution calls 

There multiple open-codes to get the hardware timer resolution.
Make a local helper function snd_timer_hw_resolution() and call it
from all relevant places.

There is no functional change by this, just a preliminary work for the
following timer resolution hardening patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-05-16 23:45:33 +02:00
parent 3ae1809725
commit fdcb5761c1
1 changed files with 14 additions and 19 deletions
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33
sound/core/timer.c
View File

@ -427,6 +427,14 @@ int snd_timer_close(struct snd_timer_instance *timeri)
}
EXPORT_SYMBOL(snd_timer_close);
static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
{
if (timer->hw.c_resolution)
return timer->hw.c_resolution(timer);
else
return timer->hw.resolution;
}
unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
{
struct snd_timer * timer;
@ -434,11 +442,8 @@ unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
if (timeri == NULL)
return 0;
timer = timeri->timer;
if (timer) {
if (timer->hw.c_resolution)
return timer->hw.c_resolution(timer);
return timer->hw.resolution;
}
if (timer)
return snd_timer_hw_resolution(timer);
return 0;
}
EXPORT_SYMBOL(snd_timer_resolution);
@ -771,10 +776,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
spin_lock_irqsave(&timer->lock, flags);
/* remember the current resolution */
if (timer->hw.c_resolution)
resolution = timer->hw.c_resolution(timer);
else
resolution = timer->hw.resolution;
resolution = snd_timer_hw_resolution(timer);
/* loop for all active instances
* Here we cannot use list_for_each_entry because the active_list of a
@ -1014,12 +1016,8 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstam
spin_lock_irqsave(&timer->lock, flags);
if (event == SNDRV_TIMER_EVENT_MSTART ||
event == SNDRV_TIMER_EVENT_MCONTINUE ||
event == SNDRV_TIMER_EVENT_MRESUME) {
if (timer->hw.c_resolution)
resolution = timer->hw.c_resolution(timer);
else
resolution = timer->hw.resolution;
}
event == SNDRV_TIMER_EVENT_MRESUME)
resolution = snd_timer_hw_resolution(timer);
list_for_each_entry(ti, &timer->active_list_head, active_list) {
if (ti->ccallback)
ti->ccallback(ti, event, tstamp, resolution);
@ -1656,10 +1654,7 @@ static int snd_timer_user_gstatus(struct file *file,
mutex_lock(&register_mutex);
t = snd_timer_find(&tid);
if (t != NULL) {
if (t->hw.c_resolution)
gstatus.resolution = t->hw.c_resolution(t);
else
gstatus.resolution = t->hw.resolution;
gstatus.resolution = snd_timer_hw_resolution(t);
if (t->hw.precise_resolution) {
t->hw.precise_resolution(t, &gstatus.resolution_num,
&gstatus.resolution_den);